EVALUATION OF AN ARTIFICIAL TEST FOR FROST HARDINESS IN WHEAT

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Abstract
A frost hardiness test that differentiates between cultivars on the basis of resistance to injury from a single minimum freezing temperature was evaluated. Four measurements of frost hardiness: survival, modal height at 14 and 21 days, and dry weight at 21 days, gave highly correlated ratings by this test. The level of repeatability of the test was considered sufficient to allow for the detection of meaningful differences in frost hardiness. However, a significant genotype by environment interaction resulted in heritability ratios that were smaller than comparable repeatability ratios. It was therefore concluded that frost tests employing a single minimum temperature can be utilized to advantage, in breeding programs, only for preliminary screening of genotypes that differ considerably in hardiness potential.

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